212769539665 has 16 divisors (see below), whose sum is σ = 258323264640. Its totient is φ = 168217695360.

The previous prime is 212769539651. The next prime is 212769539669. The reversal of 212769539665 is 566935967212.

It is not a de Polignac number, because 212769539665 - 2³¹ = 210622056017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212769539669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 763900 + ... + 1004530.

It is an arithmetic number, because the mean of its divisors is an integer number (16145204040).

Almost surely, 2^212769539665 is an apocalyptic number.

It is an amenable number.

212769539665 is a deficient number, since it is larger than the sum of its proper divisors (45553724975).

212769539665 is a wasteful number, since it uses less digits than its factorization.

212769539665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242712.

The product of its digits is 36741600, while the sum is 61.

The spelling of 212769539665 in words is "two hundred twelve billion, seven hundred sixty-nine million, five hundred thirty-nine thousand, six hundred sixty-five".